Question

A plumber charges $30 an hour plus cost of parts. The parts to fix Ben's sink cost $97. The plumber gives Ben a bill for $217. How long did it take the plumber to fix Ben's sink?

Answer 1

4 hours

Explanation:

Write an equation:

30x+97=217

Subtract 97 on both sides

30x=120

divide 30 on both sides to isolate the variable

x=4